The offshore drilling rig was invented in Texas
and, until the early 1970s, almost all the world's rigs were built in U.S.
yards. All that has now changed: of the 377 rigs listed here, only 29
were built in a year beginning with a 2. With regard to the accuracy
and completeness of this table, it's a little difficult to track the
inactive rigs: some may be cold-stacked, others may have been scrapped.
If anyone has any information that would help, please share it with me by
sending it to
timcolton@aol.com